Stop by the How I Met Your Mother store, and grab your How I Met Your Mother World's Greatest T-shirt just like the one from the season four "Not a Father's Day" episode. The World's Greatest T-shirt is great for relaxing and not chasing around children. This unisex shirt is a fun way to show that you're the world's greatest not a dad.

This shirt was a gift for my fiance. Fits great, true to size a little big, but thats ok. The length is perfect for a tall man, he can bend over without the shirt rising above his pants. Could easily make your own shirt with iron-ons.